The "central reservoir", I believe, is located on the OEM air compressor and made out of plastic and cracks. Arnott brand air compressor corrected that.
The valve block is located between the passenger side wheel and bumper. It is also where the air compressor is located. You would remove the fender liner to get access.
The valve block is located between the passenger side wheel and bumper. It is also where the air compressor is located. You would remove the fender liner to get access.